Interaction of Very Large Scale Motion of Coherent Structures with Sediment Particle Exposure

Water

Philipp Gmeiner¹  Sencer Yücesan¹  Christoph Hauer¹  Johannes Schobesberger¹  Daniel Wildt¹  Christine Sindelar²  Helmut Habersack²  Michael Tritthart² 

[1] Christian Doppler Laboratory for Sediment Research and Management, Muthgasse 107, 1180 Vienna, Austria;Institute of Hydraulic Engineering and River Research (IWA), University of Natural Resources and Life Sciences, Muthgasse 107, 1180 Vienna, Austria;

关键词: coherent structures;    hairpin-vortex packets;    hydrodynamic forces;    particle entrainment;    very-large-scale motions;    turbulent channel flow;   

DOI  :  10.3390/w13030248

来源: DOAJ

【 摘 要 】

A systematic variation of the exposure level of a spherical particle in an array of multiple spheres in a high Reynolds number turbulent open-channel flow regime was investigated while using the Large Eddy Simulation method. Our numerical study analysed hydrodynamic conditions of a sediment particle based on three different channel configurations, from full exposure to zero exposure level. Premultiplied spectrum analysis revealed that the effect of very-large-scale motion of coherent structures on the lift force on a fully exposed particle resulted in a bi modal distribution with a weak low wave number and a local maximum of a high wave number. Lower exposure levels were found to exhibit a uni-modal distribution.

【 授权许可】

Unknown